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An asynchronous Postgres client and mixin for Tornado applications

Project description

An set of mixins and classes for interacting with PostgreSQL using asyncio in Tornado / sprockets.http applications using aiopg.

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Installation

sprockets-postgres is available on the Python package index and is installable via pip:

pip install sprockets-postgres

Documentation

Documentation is available at sprockets-postgres.readthedocs.io.

Configuration

Configuration of sprockets-postgres is done by using of environment variables or tornado.web.Application.settings dictionary. The sprockets_postgres.ApplicationMixin will use configuration as applied to the settings dictionary, falling back to the environment variable if the value is not set in the dictionary. Keys in the settings dictionary are lowercase, and if provided as environment variables, are uppercase.

The following table details the available configuration options:

Variable Definition Type Default
postgres_url The PostgreSQL URL to connect to str  
postgres_max_pool_size Maximum connection count to Postgres per backend int 10
postgres_min_pool_size Minimum or starting pool size. int 1
postgres_connection_timeout The maximum time in seconds to spend attempting to create a new connection. int 10
postgres_connection_ttl Time-to-life in seconds for a pooled connection. int 300
postgres_query_timeout Maximum execution time for a query in seconds. int 60
postgres_hstore Enable HSTORE support in the client. bool FALSE
postgres_json Enable JSON support in the client. bool FALSE
postgres_uuid Enable UUID support in the client. bool TRUE

If postgres_url uses a scheme of postgresql+srv, a SRV DNS lookup will be performed and the lowest priority record with the highest weight will be selected for connecting to Postgres.

AWS’s ECS service discovery does not follow the SRV standard, but creates SRV records. If postgres_url uses a scheme of aws+srv, a SRV DNS lookup will be performed and the URL will be constructed containing all host and port combinations in priority and weighted order, utilizing libpq’s supoprt for multiple hosts in a URL.

Project details


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